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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba78475151739d7ace519c381bebf6d2ea6df9e320b893494569029e1d5ed4d' 
  AND token = 'hCg0n/oFC8H6LR0MlpFnUna3veU3rJ+d8Sa0OD+CHeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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