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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01c2f1fc46a533db71eb7952e46a2fb56dcc3fa9d4d3510feb3cc035c009582' 
  AND token = '151TbNH6JGlVIVS4LdSkhddAoedDQkxVS5OPcLs54yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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