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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8634a58a1bc19fb990861f6a78d12dfc7060ae22818f71e9e89cf41931a7787' 
  AND token = 'GhBLZ7MgkTmurIc4POqjAHB55kuZ9Y9NA4pr0Xku9oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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