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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d39ca9256667278d056a54f2ded85c9c4e6798f0a51822047590af0a4102ed' 
  AND token = 'AGx6VMGEj12U1s2SIfNrNu1AbrCsB7WPJQqZFJp//u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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