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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8a01750c28ea98f6bfe1c6d9763d75f8f56a0319722acc2c9467d6906aaf9b' 
  AND token = 'DugTYIW4HmGPPgGOotR34i1ZLupLVNDLDaej4I2iMm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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