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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9836fbc1bab854c8d2a64a8dc97fca63d08c94902a0ee7cc2a078f46ed95c4c3' 
  AND token = 'fQt2dDpCJOJsuIIW6fOeQ5o+C/vX/TuBPcCYW7AhoIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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