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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a52ba957d4b6fd70aa3847c3143ea2769147852e5f72db708f4ce521af1dac' 
  AND token = 'BHbj2i1GACFZhzs79L6y1ujQQZXmakUw/7Utdb1Dnig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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