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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6e90f062d72651958a805e4f0b6a22439201f1f3f5f44de1cedcd01e2385f6' 
  AND token = 'fwx8jiTyd2ie2cDp3qH4shlvG+hf+AFM+lyFZpqyOfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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