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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c9c7241e62006f59be9afb6c835a08db077846d986d380d09af22102991942' 
  AND token = 'cB/6rgA7JfETuPvvD6YM4acHHxA6gh8u8guKX1DZjgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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