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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a00de1a75bf2df6a2217cef3ecdeff1596a094eec2add5b0a8fd4248ba243a7' 
  AND token = 'zjS9GAnSCLgvVmiw3wGySv1RaVezG69sA+6zJb2xCWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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