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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d71feec43868ddb4545baad8e7abe117eb3ae5965e3e529dda46cafb9fa3ba' 
  AND token = 'zn1/UxgiPyZTPhLltUjk6spT4xUhMoFLIRNBiXiniVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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