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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5160e5496283450ed23f630a135179a9a4b3a4112796e70616c2673be6eb66f7' 
  AND token = '7y1GQbV1bQynAT3JElrPAZJn/6Ou4LoE08JVqIrELCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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