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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fedd57a5fd3728814594c59978c253b9907cf4f28bbdf2b3bfaad907d9e96a5' 
  AND token = 'KrDawfEdz1yw88M8cFQifjE1wyFQyn3Thjmh/b+K3I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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