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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e7156c5540e0d2d422bf96b3bc69edb51c973a4fcfed72aa64b6c6874f89f7' 
  AND token = 'k5Pt6mFBrgRucg4S5wOHJJkh82cI1ML0HDBY3okHJ78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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