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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a070ae0dd9f0758c62997165b14d3af2f277633dadb59e7c80e95e07567fbcc' 
  AND token = 'xZ12OtySfAskuIzZZJVDES5RcCMcoS/7bl2XXXKB0bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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