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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddb7eb063d35de0331de2ed8566a22db27cfb95b12c4c46d1d277152dfa11f4' 
  AND token = 'e3PxwkidyIPzybUfJ4P5sts8M1vt/mMJg66FgCj1UlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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