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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67988b2d873aefd5f1f383ffe356e0907e70360173795935306344cb043c180a' 
  AND token = 'HUxN2ma4IwyeBNyUGl0MMmwEvdeEtY6iz1Grfz/lOvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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