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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e96b94e888e69db8b61f2bba9d3f6f08c314ab877ce8130a868e5087fb0159e' 
  AND token = 'd8zWwIanFjZM69o732E4WOBWe4uYWKMz1+v5/mOIXws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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