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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5594e6e2349f6d7a68a2daf5d122cebdfe5abc6ba6bd1a95d1ac7618b274164' 
  AND token = 'oz9cn+c68gSkNvWHwKCL2Hlwmo3jiuMl8FE8yosYXoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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