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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3faeb2624ec96823d832097ef058122f888f6633e2e3ed72e56e270968ce0e' 
  AND token = 'cDaPyu8abDUch2ESVD34QQ+0f9tzAKwVZCP8dXhj2G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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