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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c726a19274d6e7f517a097c02dc949b5f1a0b1d6a37c0e29ba64b12c419a41a' 
  AND token = '/YvgjXmdVO9DY643kLr1kx2W1kmHMK0HxL4oYrf3phg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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