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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3877af4c1761d471460f65f0444d275b16e1f1e526111be2276e4361272827' 
  AND token = 'bpPT82z/pi8JpTHfDrVbI0D67kPVs2LNi6E5mxM6III=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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