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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea4d699a8b4bdeaa97c90e4ce75025559f7e5ed0081892e1eb28cab7db5c709' 
  AND token = '+yuz8Ewg+X1AIiSpWoNUOHPi98d7SLP5ainGgqL0HhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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