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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926d1d7796a03e4e913c0a530b8415c96350271a91c0dc0e306ca4f0f9612054' 
  AND token = 'jJxIs5qnWkXHB++I1t72zSfnqjB2Ho/7j7TVmgiMGAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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