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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3690701a94c1ff88145e4d4e9e3e3601cc91ca408856eccc625e2110fa8a0b4e' 
  AND token = '9+wjFPo30WAmXxBH5R/TEXp6kiKf6wy0/MGz5Xr0l7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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