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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f293b7fbf2667e1f4650b89b3034d4ad5e15b8c9b9138bb2be42cf4c3a4c9481' 
  AND token = '89NCERTrBHFq7d1mIIL5Hkc7BSEJC1DPNO5AAnWwzK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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