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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf11edfc95bb12130b0525775a37d9a28e1e175f10005333412f5121af755a2' 
  AND token = 'f2xHo1bptwRvhqwjnYmEkft79Msm3IveSvpYer7t5IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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