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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2cbd4aca3989e740b8a0e15580cb8d3dd0151687c2efabd0ac4c2a0268ed22e' 
  AND token = '+DasZcP5O9lqOqdo6FCYK0Ol+3Q92uajW8HVjDKG4cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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