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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b913b8253ce9669cb2a221cd63bc782ef92d7e35ace5aadec8a5f0a5a5ccbe2' 
  AND token = 'OlhM5txLfx8cKq2avCAIn/UEXVbaDvLcmErLDLnuG2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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