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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d546196d5b00b400b7fde9d33d5aac1d8e4f6f1d919e82ce1106dfd3695426' 
  AND token = 'H8NspDDBvqcP4CifL1rTpuNbj/BjM8RTlTFRz5214u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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