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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4ecdba9ef4644e2448243f68651c97b36052a528cb9894e6a06356b1f01ee2' 
  AND token = '9E+sR5rJRamBI/HYlVCRhbY2xHNfOBJc+omophRMtgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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