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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5ea3eabad79f9e8d547b2bb16737ddc4f1fa5f87170f695f4d9148418a6ad6' 
  AND token = 'dhXc3H6eFDAuM4nG4rhlifmSgDh1unHSQjQS/uKH5JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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