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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae15dba1c97e1feb6e303b604ac3c65a8467bbec09611e797b21adbbb31a131b' 
  AND token = 'uTfmcN6JcnA7fW/m1GmydVj1eHC6E/lo8RGNu1jieek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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