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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209c2c78d8e5e37e29877b975735b1f9df0597f252bdbd2285a1b7cc9474d7f7' 
  AND token = 'JrOTRuX5S2oczrK/sLREydsu9VicQDmpLwIcQC5oBqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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