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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fa1484f262e312471b7e4b52c77bb8ae94043c2a1b17150462c2f9d47079fe' 
  AND token = 'jSreJHBgowCxuSBFFiShrpYlkcw74M8oHLErFFoY7+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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