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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c71eebeacb91ff41e06d80a96a904de8eff733a2da73acea6646f9fd7da817d' 
  AND token = '9JyGIwGgSk30wRL+Pxktdvn6qY/6Ks8T3owJ5GA7npI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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