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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a0002c64896c15935458ce8c6c9880b3751b0f262193e78325043cdb85f667' 
  AND token = '+06kw9WmRfVytL/gBFcfRlEntOo4t0iMCp+VH3aHmeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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