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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f630912c4cba7a70a5f5952fcb5bbc01be91fd52834b3f0a74c994cff2aa6f' 
  AND token = 'wAxE42PGOaReZQNS3L56ydYezcm2D1tvahm/Tm2WOrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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