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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab2fa97c6b2e756487af2794f4ceb8905db56ff4eb262a88be41c1b6c606966' 
  AND token = '2HmCyUTMxhBBRuQQxvQdWAk7cp8eM2ix0IAJFogNObE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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