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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8208fbf1c9dec58a88cc9576c3639305f984f251af6917534aa8394845d8097d' 
  AND token = '3LCG16uxTIKPgGTVRLa1a7cxgIY6Y1vq4AEyBNsJ2Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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