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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d2189ffa90b4f47b3a5ea7e4f610db5fa4e4d9fd9ea9b1f008135a77540b7d' 
  AND token = '4oW+byZ/CW1R33avJKfKB9t+jPME5t1VbTtcB1G1nyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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