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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bead98af0dbeca1c3f069c45dee0b917689ed8f527c47c587c7bbac827c4625d' 
  AND token = '25sJ8lLNEH1+Wzmd5vMS0xDurvdR/RQ2lqXmj5Nj7io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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