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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45d99f65def28770f1904fa73ff724078d078aacc335a67af7d792bbb62a7eb' 
  AND token = '7p4hIncem/8CG5xrcCY40Sv736qjEfS38NyWT5FxYyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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