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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8823bbc05d09bbf284f00da37b01176c6c2fd789f95e25f5632afecb466956' 
  AND token = 'xvrNh3qSapMO2g4kNy/M3uImlCzOfZl9z0aNiYJ0SYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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