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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b7fd6514487d20cb986400fbecd9e36d82b64e61c42243f2242ca1f54a4182' 
  AND token = 'xCxh+x2FpeVG85lT8V8rrEb+6f+z6uhWf2oIX+TQ9ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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