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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55abbc8eb169576ccb91de89f3d34526f91fa225d7d1bdcc1e29218e9e5d736f' 
  AND token = '1IzOhdOei5HEs+JK155H1OJdRae0A9/DUXDLDVqH/ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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