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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f5fc71cdb419746da4030c6a0a691a6941269569a13d8d4ad6cd6b87134ac2' 
  AND token = 'q1p2+Rp/rcwwdOPjuSTVRSzFeWmW1pSSAgPV5Kiecgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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