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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ebed7c0fcc04441a752a96f8ca76ccb7976e4f290da087fa3e8f5bba9a731b' 
  AND token = 'la1OhIntwyAAYSP1obqAb8UqYjz0v6rbdxOVjffhUD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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