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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6ca18f6a502539d908c52e2c72af942e985e5e3435a4be00650abf7ec8a62c' 
  AND token = 'neF4/bXonTi/ul/Qil/Jk3nOwE+JgamGHxY9UHN/l+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}