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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5de3ea34d22caefebb804099ae3021fd6f4c0558bc11198096327218a38694' 
  AND token = 'WJ26ZBI1d2HnezHTzEJrIN9yUPzjB9AOx6iCaVWfsEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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