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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed24dcc035c1ac8f200b74483f7d72a8412847eb9681f8711f98686f03d56786' 
  AND token = 'Sd/s8QCvOEH5ORK3pH42rGdZbMqBO0Essu+sq1hbH38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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