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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e174c297ed2de642b55d586dbf06683ccde7c3eb0f7d015f3e4ef87560e15a0' 
  AND token = 's7iWAPGuRZAlMIVpbeGu256aEDn5RDOMjscD6n0Iv9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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